from flask import Blueprint, jsonify, request, make_response
from flask_httpauth import HTTPBasicAuth

from cscourses import db
from cscourses.models import Course, User

bp_api = Blueprint('api', __name__, url_prefix='/api')


@bp_api.after_request
def add_header(response):
    response.headers['Content-Type'] = 'application/json'
    return response


@bp_api.errorhandler(404)
def not_found(error):
    error = {
        'status': 404,
        'message': 'Not Found: ' + request.url,
    }
    response = jsonify(error)
    return make_response(response, 404)


@bp_api.errorhandler(401)
def not_authorised():
    error = {
        'status': 401,
        'message': 'You must provide username and password to access this resource',
    }
    response = jsonify(error)
    return make_response(response, 404)


@bp_api.route('/courses', methods=['GET'])
def read_courses():
    courses = Course.query.all()
    json = jsonify(courses=[c.serialize for c in courses])
    return make_response(json, 200)


@bp_api.route('/courses/<int:course_id>', methods=['GET'])
def read_course(course_id):
    course = Course.query.filter_by(id=course_id).first_or_404()
    json = jsonify(course=course.serialize)
    return make_response(json, 200)


@bp_api.route('/courses', methods=['POST'])
def create_course():
    '''To create a new course all fields must be provided'''
    # request.args.get() will return None if the arg is not present in the request
    course_code = request.args.get('course_code', type=str)
    name = request.args.get('name', type=str)
    teacher_id = request.args.get('teacher_id', type=int)
    # The following line checks if any of the variables are None
    if None in (course_code, name, teacher_id):
        headers = {"Content-Type": "application/json"}
        json = jsonify({'message': 'Please provide: course_code, name, teacher_id'})
        return make_response(json, 400, headers)
    course = Course(course_code=course_code, name=name, teacher_id=teacher_id)
    db.session.add(course)
    db.session.commit()
    json = jsonify(Course=course.serialize)
    return make_response(json, 201)


@bp_api.route('/courses/<int:course_id>', methods=['PUT'])
def update_course(course_id):
    # Find the course by its ID
    course = db.session.query(Course).filter_by(id=course_id).first_or_404()
    # Create variables using the values posted in the request
    course_name = request.args.get('course_name')
    teacher_id = request.args.get('teacher_id')
    course_code = request.args.get('course_code')
    # If any of the variables have a provided value then update the database
    if course_name is not None:
        course.name = course_name
    if teacher_id is not None:
        course.teacher_id = teacher_id
    if course_code is not None:
        course.course_code = course_code
    db.session.commit()
    json = jsonify({'message': 'Updated Course with id {}'.format(course.id)})
    return make_response(json, 200)


@bp_api.route('/courses/<int:course_id>', methods=['DELETE'])
def delete_course(course_id):
    course = Course.query.filter_by(id=course_id).one()
    db.session.delete(course)
    db.session.commit()
    json = jsonify({'message': 'Removed Course with id {}'.format(course_id)})
    return make_response(json, 200)
    

   
{'courses': [{'course_code': 'COMP0015', 'course_id': 1, 'name': 'Introduction to Programming', 'teacher_id': 6}, 
                    {'course_code': 'COMP0034', 'course_id': 2, 'name': 'Software Engineering', 'teacher_id': 5}]
}
  

import requests

@bp_main.route('/api_courses', methods=['GET'])
def api_courses():
response = requests.get('http:https://localhost:5000/api/courses', auth=('sarah_api', 'sanders'))
# response.json returns a dict, in this case it is a nested dictionary
courses = response.json()
return render_template('courses_api_client.html', courses=courses)

@bp_main.route('/news')
def news():
    # Make an API call, and store the response.
    url = 'https://hacker-news.firebaseio.com/v0/topstories.json'
    response = requests.get(url)
    # Process information about the first 10 news item in the top stories list.
    item_ids = response.json()
    stories = []
    for item_id in item_ids[:10]:
        # Make a separate API call for each item.
        url = ('https://hacker-news.firebaseio.com/v0/item/' + str(item_id) + '.json')
        response = requests.get(url)
        story_data = response.json()
        story = {'title': story_data['title'], 'url': story_data['url'], }
        stories.append(story)
    return render_template('news.html', stories=stories)